NZ253802A - Device for admixing a processing agent to a pulp suspension in a container - Google Patents

Device for admixing a processing agent to a pulp suspension in a container

Info

Publication number
NZ253802A
NZ253802A NZ253802A NZ25380293A NZ253802A NZ 253802 A NZ253802 A NZ 253802A NZ 253802 A NZ253802 A NZ 253802A NZ 25380293 A NZ25380293 A NZ 25380293A NZ 253802 A NZ253802 A NZ 253802A
Authority
NZ
New Zealand
Prior art keywords
pulp suspension
propeller
hub
pulp
processing agent
Prior art date
Application number
NZ253802A
Inventor
Kjell Forslund
Original Assignee
Sunds Defibrator Ind Ab
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Sunds Defibrator Ind Ab filed Critical Sunds Defibrator Ind Ab
Publication of NZ253802A publication Critical patent/NZ253802A/en

Links

Classifications

    • DTEXTILES; PAPER
    • D21PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21BFIBROUS RAW MATERIALS OR THEIR MECHANICAL TREATMENT
    • D21B1/00Fibrous raw materials or their mechanical treatment
    • D21B1/04Fibrous raw materials or their mechanical treatment by dividing raw materials into small particles, e.g. fibres
    • D21B1/12Fibrous raw materials or their mechanical treatment by dividing raw materials into small particles, e.g. fibres by wet methods, by the use of steam
    • D21B1/30Defibrating by other means
    • D21B1/34Kneading or mixing; Pulpers
    • D21B1/342Mixing apparatus
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01FMIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F27/00Mixers with rotary stirring devices in fixed receptacles; Kneaders
    • B01F27/60Mixers with rotary stirring devices in fixed receptacles; Kneaders with stirrers rotating about a horizontal or inclined axis
    • B01F27/71Mixers with rotary stirring devices in fixed receptacles; Kneaders with stirrers rotating about a horizontal or inclined axis with propellers
    • B01F27/711Mixers with rotary stirring devices in fixed receptacles; Kneaders with stirrers rotating about a horizontal or inclined axis with propellers co-operating with stationary guiding means, e.g. baffles
    • B01F27/7111Mixers with rotary stirring devices in fixed receptacles; Kneaders with stirrers rotating about a horizontal or inclined axis with propellers co-operating with stationary guiding means, e.g. baffles the guiding means being tubes surrounding the propellers
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01FMIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F35/00Accessories for mixers; Auxiliary operations or auxiliary devices; Parts or details of general application
    • B01F35/40Mounting or supporting mixing devices or receptacles; Clamping or holding arrangements therefor
    • B01F35/41Mounting or supporting stirrer shafts or stirrer units on receptacles
    • B01F35/411Mounting or supporting stirrer shafts or stirrer units on receptacles by supporting only one extremity of the shaft
    • B01F35/4113Mounting or supporting stirrer shafts or stirrer units on receptacles by supporting only one extremity of the shaft at a side wall of the receptacle

Landscapes

  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Wood Science & Technology (AREA)
  • Mechanical Engineering (AREA)
  • Paper (AREA)
  • Mixers Of The Rotary Stirring Type (AREA)
  • Pharmaceuticals Containing Other Organic And Inorganic Compounds (AREA)
  • Accessories For Mixers (AREA)
  • Grinding-Machine Dressing And Accessory Apparatuses (AREA)
  • Percussion Or Vibration Massage (AREA)

Abstract

PCT No. PCT/SE93/00424 Sec. 371 Date Dec. 27, 1995 Sec. 102(e) Date Dec. 27, 1995 PCT Filed May 14, 1993 PCT Pub. No. WO94/00227 PCT Pub. Date Jan. 6, 1994.Apparatus for mixing a processing medium with the pulp suspension within a bin is disclosed, the apparatus including a housing attached to a wall of the bin, a rotary shaft extending through the housing with a propeller attached to the shaft by means of a hub, and a nozzle surrounding the propeller for directing the pulp suspension from an inlet in the nozzle to the propeller. The housing includes a dilution chamber for the processing medium and an outlet from the dilution chamber for directing the processing medium towards the hub, and includes a gap separating the outlet aperture from the hub so that the processing medium can be contacted with the pulp suspension before the pulp suspension reaches the propeller.

Description

253802 New Zealand No. 253802 International No. PCT"/SE 93/00424 TO BE ENTERED AFTER ACCEPTANCE AND PUBUCATION Priority dates: So- «»• ^2.
International filing date: iu-- S • °t3.
Classification: oa,)c-CtUo.
Publication date: 2 6 SEP 1995 Journal No.: NEW ZEALAND PATENTS ACT 1953 COMPLETE SPECIFICATION Title of invention: Device for admixing a processing agent to a jbulp suspension Name, address and nationality of applicaiiT(s) as in international application form: SUNDS DEFIBRATOR INDUSTRIES AB S-851 94 Sundsvall Sweden WO 94/00227 ^ w E93/ 0 V w w ^ Device for admixing a processing agent to a pulp suspension This invention relates to a device for admixing a processing agent to a pulp suspension in a bin. The agent can consist of liquids and chemicals, substantially in fluid state, for dilution or other treatment.
At all kinds of pulp processing, a persistently continuous and proportional admixture of processing agent to the pulp is of decisive importance for obtaining an acceptable result.
In known devices the processing agent is admixed in the lower portion of a pulp bin. The mixing device comprises a propeller, which accelerates the pulp to a high rate through a nozzle whereby surrounding pulp is sucked in continuously. The processing agent is added to the pulp before it is sucked into the mixing device. High pulp concentration in the bin, for example 12%, however, implies a problem for achieving continuous admixing. In order to reduce this problem, the bin has been designed so as to have a bottom zone of reduced size. This, however, results in a decrease in processing volume and in a more complicated and more expensive bin design. Such an arrangement also requires more energy, due to an incomplete admixing technique.
According to the present invention, the above problem is eliminated in that the processing agent is added and distributed centrally, and the pulp flow is improved. The mixing result is improved, and at the same time the energy consumption is minimized. The characterizing features of the invention are apparent from the attached claims.
The invention is described in greater detail in the following, with reference to the accompanying drawing showing an embodiment of the invention.
Fig. 1 is a cross-section of a mixing device according to the invention; Fig. 2 is a section according to II-II in Fig. 1; Fig. 3 is an alternative embodiment of the invention.
The mixing device in Fig. 1 comprises a conical housing - . < " "A 1 with a flange 2 to be attached in the lower portion of a. bin for the pulp suspension to which the processing agent is to be 2 admixed. The housing 1 comprises a supply chamber 3 with a connection 13, through which the processing agent is introduced. In the housing 1, a rotary shaft 6 is located which is supported in bearings 9 and which via a sealing 4 extends into the bin. The shaft 6 is driven by a motor (not shown) located outside the bin. At the other end of the shaft 6 a propeller 12 is attached and formed with a hug 7. The internal portion of the housing 1 located nearest to the propeller hub 7 consists of an overall dilution chamber 5, which communicates with the supply chamber 3 through a passage 14. The dilution chamber 5 has an annular aperture 15 to the hub 7. Between the housing 1 and the hub 7 a gap 8 is defined which is adjustable by moving the shaft 6 axially. The gap embodies preferably 360° of the circumference.
The sealing 4, which substantially is a mechanical one, is located in direct connection to the dilution chamber 5 and, therefore, does not come into contact with the pulp suspension, whereby clogging is prevented.
On the conical housing 1 with flange 2 a number of guide bars 10 are attached. The guide bars 10 are substantially radial and constitute a hold for the nozzle 11, which is located about the propeller 12 and comprises a converging inlet and, respectively, outlet portion and a substantially cylindric central portion. The guide bars 10, preferably at least eight in number, extend along the entire length of the nozzle 11 in such a manner, that the outer diameter of the guide bars 10 coincides with the inlet diameter of the nozzle 11. In the cylindric portion of the nozzle 11, the inner diameter of the guide bars 10 is constant. The distance between the blades of the propeller 12 and the guide bars is 10-15 mm.
The processing agent is introduced via the chamber 3 to the dilution chamber 5, from which the agent is distributed all about the adjustable gap 8. At its egress from the gap 8, the agent is admixed to the pulp suspension when the suspension by action of the propeller 12 passes the mixing zone outside the gap 8 at a high rate. The flow of the pulp suspension there is substantially greater than that of the processing agent.. 4 »T«he admixing takes place by means of the blades of the propeller 12 against the guide bars 10. 3 The guide bars 10 prevent concurrent rotation of the pulp in the inlet to the nozzle 11. The pulp flow, therefore, is substantially laminar all the way to the gap 8. Due to the rotation, the pulp jet leaving the nozzle 11 at a high rate has a greater cast length and at the same time also the through flow increases. This results in a very efficient admixture.
In the embodiment according to Fig. 3 a number of holes 16, e.g. 4-8, are made through the hub 7. Further, a second gap 17 is arranged in the hub in front of the blades of the propeller 12. In this embodiment a part of the flow of the processing agent is passing through the holes 16 in the hub 7 and out through the gap 17 for admixing to the pulp suspension after the blades of the propeller 12, counted in the direction of flow. Such an embodiment can be advantageous in some installations. Also, instead of the second gap in the hub there can be arranged a number of holes.
The admixture preferably is carried out at a pulp concentration of 1-8% in the mixing zone. The energy input for the mixing work can be limited to 0.5-1.5 kW/m3 pulp. The rate in the mixing zone can be 1-3 m/sec.
The invention is not restricted to the embodiment shown, but can be varied within the scope of the invention idea. 253802
NZ253802A 1992-06-30 1993-05-14 Device for admixing a processing agent to a pulp suspension in a container NZ253802A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE9202011A SE500879C2 (en) 1992-06-30 1992-06-30 Apparatus for mixing treatment medium in a pulp suspension in a container

Publications (1)

Publication Number Publication Date
NZ253802A true NZ253802A (en) 1995-09-26

Family

ID=20386652

Family Applications (1)

Application Number Title Priority Date Filing Date
NZ253802A NZ253802A (en) 1992-06-30 1993-05-14 Device for admixing a processing agent to a pulp suspension in a container

Country Status (16)

Country Link
US (1) US5505540A (en)
EP (1) EP0652802B1 (en)
JP (1) JPH07508211A (en)
CN (1) CN1035599C (en)
AT (1) ATE151659T1 (en)
AU (1) AU665447B2 (en)
BR (1) BR9306644A (en)
CA (1) CA2135900A1 (en)
DE (1) DE69309932T2 (en)
ES (1) ES2100545T3 (en)
FI (1) FI109526B (en)
NO (1) NO303624B1 (en)
NZ (1) NZ253802A (en)
SE (1) SE500879C2 (en)
WO (1) WO1994000227A1 (en)
ZA (1) ZA934235B (en)

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE506647C2 (en) * 1994-11-03 1998-01-26 Sunds Defibrator Ind Ab mixing device
DE69610597T3 (en) 1995-03-03 2005-11-03 Alltech Associates, Inc., Deerfield METHOD AND DEVICE FOR ELECTROCHEMICAL CHANGING OF CHROMATOGRAPHIC MATERIAL
JP4596658B2 (en) * 2000-03-10 2010-12-08 佐竹化学機械工業株式会社 Stirrer for aeration stirring
JP4537626B2 (en) * 2001-07-26 2010-09-01 荏原エンジニアリングサービス株式会社 Powdered activated carbon supply equipment
SE524466E (en) * 2002-12-12 2007-09-04 Metso Paper Inc Apparatus for mixing a gaseous or liquid chemical medium with a pulp suspension
FR2971170B1 (en) 2011-02-09 2014-07-04 Clextral DEVICE FOR THE CONTINUOUS TREATMENT OF AT LEAST ONE RAW MATERIAL
CN102797849B (en) * 2011-05-27 2016-04-20 上海东冠纸业有限公司 The angle of rake black box of a kind of agitating pulp
AU2019446331A1 (en) 2019-05-10 2021-11-11 Sandvik Srp Ab Disc, spacer and transportation assembly
IT201900023289A1 (en) * 2019-12-06 2021-06-06 Ies Biogas S R L SYSTEM AND PROCEDURE FOR INSTALLING A TREE

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2833630A (en) * 1954-01-21 1958-05-06 Harvey Machine Company Inc Apparatus for leaching
US2887305A (en) * 1955-01-19 1959-05-19 Cornelis Jacobus Van Ginneken Installation for continuously mixing a powdery material with a viscous liquid, in particular meal with molasses
US3202281A (en) * 1964-10-01 1965-08-24 Weston David Method for the flotation of finely divided minerals
US3912231A (en) * 1974-01-17 1975-10-14 Gustafson Inc Apparatus for treating and mixing particles
FI85164B (en) * 1990-05-21 1991-11-29 Ahlstroem Oy Method and arrangement for mixing liquid in a medium

Also Published As

Publication number Publication date
DE69309932D1 (en) 1997-05-22
DE69309932T2 (en) 1997-07-24
CA2135900A1 (en) 1994-01-06
ZA934235B (en) 1994-01-12
EP0652802A1 (en) 1995-05-17
FI946152A (en) 1994-12-29
SE500879C2 (en) 1994-09-26
JPH07508211A (en) 1995-09-14
NO303624B1 (en) 1998-08-10
EP0652802B1 (en) 1997-04-16
ES2100545T3 (en) 1997-06-16
SE9202011L (en) 1993-12-31
CN1085618A (en) 1994-04-20
WO1994000227A1 (en) 1994-01-06
SE9202011D0 (en) 1992-06-30
ATE151659T1 (en) 1997-05-15
FI109526B (en) 2002-08-30
NO945072D0 (en) 1994-12-29
US5505540A (en) 1996-04-09
CN1035599C (en) 1997-08-13
AU4516593A (en) 1994-01-24
AU665447B2 (en) 1996-01-04
FI946152A0 (en) 1994-12-29
BR9306644A (en) 1998-12-08
NO945072L (en) 1994-12-29

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